Ceara Rise

Curry, W.B.; Shackleton, N.J.; Richter, C.

doi:10.2973/odp.pr.154.1994

Cited by 13 publications

(25 citation statements)

References 8 publications

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“…The high calcium carbonate content (55%, Parthiban 2005) in the CC is due to its location (4068 m) above the carbonate compensation depth (Banakar et al 1998). The negative correlation between carbonate and χ is similar to the earlier observations (Curry et al 1995;Frederichs et al 1999). In CC, Al exc and calcium carbonate show strong positive correlation (r = 0.86) (Parthiban 2005).…”

Section: Relationship Between Elemental Concentration and Magnetic Susupporting

confidence: 81%

“…Therefore, temporal records of sedimentary χ might indicate changes in relative variations of biogenic, authigenic, and terrigenous components. The χ has been widely used in conjunction with several other palaeoclimate proxies such as calcium carbonate and oxygen isotopes in deep sea sediments as a useful paleoclimate indicator (Kent 1982;Robinson 1986;Mead et al 1986;Doh et al 1988;Sager and Hall 1990;Bloemendal et al 1988Bloemendal et al , 1992, changing sedimentary environment (Curry et al 1995) and pollution studies (Petrovsky et al 1998;Maiti et al 2005). Shankar et al (1994) studied a large number of deep Arabian Sea surface sediments and suggested that χ can be used to estimate the iron content of marine sediments.…”

Section: Introductionmentioning

confidence: 98%

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Relationship between chemical composition and magnetic susceptibility in sediment cores from Central Indian Ocean Basin

et al. 2008

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Three sediment cores in a north-south transect (3 • N to 13 • S) from different sediment types of the Central Indian Ocean Basin (CIOB) are studied to understand the possible relationship between magnetic susceptibility (χ) and Al, Fe, Ti and Mn concentrations. The calcareous ooze core exhibit lowest χ (12.32 × 10 −7 m 3 kg −1 ), Al (2.84%), Fe (1.63%) and Ti (0.14%), terrigenous clay core with moderate χ (29.93 × 10 −7 m 3 kg −1 ) but highest Al (6.84%), Fe (5.20%) and Ti (0.44%), and siliceous ooze core with highest χ (38.06 × 10 −7 m 3 kg −1 ) but moderate Al (4.49%), Fe (2.80%) and Ti (0.19%) contents. The distribution of χ and detrital proxy elements (Al, Fe, and Ti) are identical in both calcareous and siliceous ooze. Interestingly, in terrigenous core, the behaviour of χ is identical to only Ti content but not with Al and Fe suggesting possibility of Al and Fe having a non-detrital source.The occurrence of phillipsite in terrigenous clay is evident by the Al-K scatter plot where trend line intersects K axis at more than 50% of total K suggesting excess K in the form of phillipsite. Therefore, the presence of phillipsite might be responsible for negative correlation between χ and Al (r = −0.52). In siliceous ooze the strong positive correlations among χ, Al exc and Fe exc suggest the presence of authigenic Fe-rich smectite. High Mn content (0.5%) probably in the form of manganese micronodules is also contributing to χ in both calcareous and siliceous ooze but not in the terrigenous core where mean Mn content (0.1%) is similar to crustal abundance. Thus, χ systematically records the terrigenous variation in both the biogenic sediments but in terrigenous clay it indirectly suggests the presence of authigenic minerals.

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Section: Relationship Between Elemental Concentration and Magnetic Susupporting

confidence: 81%

Section: Introductionmentioning

confidence: 98%

Relationship between chemical composition and magnetic susceptibility in sediment cores from Central Indian Ocean Basin

et al. 2008

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“…(1) An inward‐radial remagnetization as documented by D. Schneider and J.‐P. Valet (in Curry et al 1995), Fuller et al (1997) and Fuller et al (1998), who invoke cutting‐shoe and/or core barrel fields as the sediment’s remagnetizing agent.…”

Section: Interpreting the Hole 690b Overprintmentioning

confidence: 99%

Magnetostratigraphic reinvestigation of the Palaeocene/Eocene boundary interval in Hole 690B, Maud Rise, Antarctica

Ali

Kent

Hailwood³

2000

Geophysical Journal International

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Hole 690B, drilled on Maud Rise near Antarctica, provides one of the most important Palaeocene/Eocene boundary interval sections. Magnetostratigraphy plays a key role in dating Palaeocene/Eocene boundary events, but there are two problems with the published scheme in Hole 690B. The first concerns major mismatches of several magnetozones and biozones in the succession. The second is an unexplained pervasive declination cluster, which should not be present in these azimuthally unoriented piston cores. To resolve these issues, a palaeomagnetic reinvestigation was carried out on 98 specimens from 12 cores through the upper Palaeocene–middle Eocene section in Hole 690B. The bulk of the samples carry an approximately uniformly directed magnetically hard component resulting in a declination cluster effectively identical to that of the earlier study. The spurious magnetization can be explained either as an ‘inward‐radial magnetization’ or as a ‘core‐split overprint’. By estimating the extent of the overprint within each sample, it has been possible to construct a filtered magnetostratigraphy for the section. The result is that many of the magnetozone–biozone mismatches are eliminated, and the record of the 2.5 Myr Chron C24r, which brackets the various events associated with the Palaeocene/Eocene boundary, is considerably cleaner. It is not possible to define the upper and lower boundaries of this magnetochron, so we recommend that the dating of the events within this section be based on the biostratigraphy only.

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“…36). This is probably the result of a radial magnetization, as recorded in Leg 154 cores (Curry, Shackleton, Richter, et al, 1995). The bimodal nature of the overprinting magnetization probably results from the alternation of two separate inner core barrels during APC coring.…”

Section: Remanent Magnetizationmentioning

confidence: 82%

Site 960

1996

Proceedings of the Ocean Drilling Program

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Ceara Rise

Cited by 13 publications

References 8 publications

Relationship between chemical composition and magnetic susceptibility in sediment cores from Central Indian Ocean Basin

Relationship between chemical composition and magnetic susceptibility in sediment cores from Central Indian Ocean Basin

Magnetostratigraphic reinvestigation of the Palaeocene/Eocene boundary interval in Hole 690B, Maud Rise, Antarctica

Site 960

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